public DCMatrix(string path)
{
BitMiracle.LibJpeg.Classic.jpeg_decompress_struct oJpegDecompress = new BitMiracle.LibJpeg.Classic.jpeg_decompress_struct();
System.IO.FileStream oFileStreamImage;
try
{
oFileStreamImage = new System.IO.FileStream(path, System.IO.FileMode.Open, System.IO.FileAccess.Read);
}
catch
{
throw new Exception("Error reading");
}
oJpegDecompress.jpeg_stdio_src(oFileStreamImage);
oJpegDecompress.jpeg_read_header(true);
BitMiracle.LibJpeg.Classic.jvirt_array <BitMiracle.LibJpeg.Classic.JBLOCK>[] JBlock = oJpegDecompress.jpeg_read_coefficients();
if (JBlock[2] != null)
{
ExtractChannel(oJpegDecompress, JBlock, 0, ref Y);
ExtractChannel(oJpegDecompress, JBlock, 1, ref Cb);
ExtractChannel(oJpegDecompress, JBlock, 2, ref Cr);
}
else
{
ExtractChannel(oJpegDecompress, JBlock, 0, ref B);
}
}
static void Main(string[] args)
{
//Console.WriteLine("args[1]:%s", args[1]);
string sourceImagePath = null;
string destinationImagePath = null;
//引数の数がおかしい時の処理h
//今は雑デバッグ向けに暫定対応
if (args.Length != 2)
{
Console.Write("入力ファイルパスを入力してね");
sourceImagePath = Console.ReadLine();
Console.Write("出力ファイルパスを入力してね");
destinationImagePath = Console.ReadLine();
}
/*else
* {
* sourceImagePath = args[1];
* destinationImagePath = args[2];
* }*/
//元ファイルを開いてDCT係数を引っこ抜く
try
{
using (System.IO.FileStream sourceImageStream = new System.IO.FileStream(sourceImagePath, System.IO.FileMode.Open, System.IO.FileAccess.Read))
using (System.IO.FileStream destinationImageStream = new System.IO.FileStream(destinationImagePath, System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.Write))
{
//todo: ここにJPEGのDCT係数を引っこ抜く処理を書く
BitMiracle.LibJpeg.Classic.jpeg_decompress_struct sourceImageStruct = new BitMiracle.LibJpeg.Classic.jpeg_decompress_struct();
sourceImageStruct.jpeg_stdio_src(sourceImageStream);
sourceImageStruct.jpeg_read_header(true);
}
}
catch (ArgumentException ex)
{
Console.WriteLine("何かおかしいです");
throw;
}
catch (System.Security.SecurityException ex)
{
Console.WriteLine("ファイルへのアクセス権がありません");
throw;
}
catch (System.IO.IOException ex)
{
Console.WriteLine("ファイルにアクセスしようとしたらエラーを吐きました");
throw;
}
}
private void ExtractChannel(BitMiracle.LibJpeg.Classic.jpeg_decompress_struct oJpegDecompress,
BitMiracle.LibJpeg.Classic.jvirt_array <BitMiracle.LibJpeg.Classic.JBLOCK>[] JBlock,
int c, ref short[][] Target)
{
var lengthOfChannel = oJpegDecompress.Comp_info[c].Width_in_blocks;
var reader = JBlock[c].Access(0, 1);
int realWidth = 0;
for (int i = 0; i < lengthOfChannel; i++)
{
try
{
reader = JBlock[c].Access(i, 1);
}
catch
{
realWidth = i;
break;
}
}
realWidth = (realWidth != 0) ? realWidth : lengthOfChannel;
reader = JBlock[c].Access(0, realWidth);
numOfMatrix = 0;
int sizeX = reader.Length;
Target = new short[reader.Length * reader[0].Length][];
for (int i = 0; i < reader.Length; i++)
{
for (int j = 0; j < reader[i].Length; j++)
{
Target[numOfMatrix] = new short[64];
for (int k = 0; k < 64; k++)
{
Target[numOfMatrix][k] = reader[i][j][k];
}
++numOfMatrix;
}
}
}
private async void bEmbed(object sender, RoutedEventArgs e)
{
txtData = new TextRange(etxtMessage.Document.ContentStart, etxtMessage.Document.ContentEnd).Text;
if (etxtImagePath.Text.Length == 0 && txtData.Length == 0)
{
await this.ShowMessageAsync("Error:", "Image file and text data is not selected.");
return;
}
else if (etxtImagePath.Text.Length == 0)
{
await this.ShowMessageAsync("Error:", "Image file and is not selected.");
return;
}
else if (txtData.Length == 0)
{
await this.ShowMessageAsync("Error:", "Enter text to hide.");
return;
}
try
{
var controller = await this.ShowProgressAsync("Please wait:", "Embedding...");
BitMiracle.LibJpeg.Classic.jpeg_decompress_struct oJpegDecompress = new BitMiracle.LibJpeg.Classic.jpeg_decompress_struct();
System.IO.FileStream oFileStreamImage = new System.IO.FileStream(etxtImagePath.Text, System.IO.FileMode.Open, System.IO.FileAccess.Read);
oJpegDecompress.jpeg_stdio_src(oFileStreamImage);
oJpegDecompress.jpeg_read_header(true);
BitMiracle.LibJpeg.Classic.jvirt_array <BitMiracle.LibJpeg.Classic.JBLOCK>[] DCTcoff = oJpegDecompress.jpeg_read_coefficients();
int hightTemp = (int)Math.Ceiling(coverimage.Height / 8.0);
int widthTemp = (int)Math.Ceiling(coverimage.Width / 8.0);
int widthComponent1 = widthTemp % 2 == 0 ? widthTemp : widthTemp + 1;
int heightComponent1 = hightTemp % 2 == 0 ? hightTemp : hightTemp + 1;
int widthComponent2_3 = widthComponent1 / 2;
int heightComponent2_3 = heightComponent1 / 2;
string dataBitsToSave = string.Join("", Encoding.UTF8.GetBytes(txtData).Select(b => Convert.ToString(b, 2).PadLeft(8, '0'))); dataBitsToSave += "00000000";
Int32 number_SavedBits = 0;
bool operationTerminator = false;
for (int colorIterate = 0; colorIterate < 3 && !operationTerminator; colorIterate++)
{
int height = colorIterate == 0 ? heightComponent1 : heightComponent2_3, width = colorIterate == 0 ? widthComponent1 : widthComponent2_3;
for (int heightIteratein2D = 0; heightIteratein2D < height && !operationTerminator; heightIteratein2D++)
{
for (int widthIteratein2D = 0; widthIteratein2D < width && !operationTerminator; widthIteratein2D++)
{
for (int cofficentNumber = 1; cofficentNumber < 64 && !operationTerminator; cofficentNumber++)
{
short cofficent = DCTcoff[colorIterate].Access(heightIteratein2D, 1)[0][widthIteratein2D][cofficentNumber];
if (number_SavedBits == dataBitsToSave.Length)
{
operationTerminator = true;
}
else
{
if (!dataBitsToSave[number_SavedBits].ToString().Equals((cofficent & 1).ToString()))
{
DCTcoff[colorIterate].Access(heightIteratein2D, 1)[0][widthIteratein2D][cofficentNumber] = (short)(cofficent ^ 1);
}
number_SavedBits++;
}
}
}
}
}
oJpegDecompress.jpeg_finish_decompress();
oFileStreamImage.Close();
System.IO.FileStream objFileStreamMegaMap = System.IO.File.Create(@"" + etxtImagePath.Text.Substring(0, etxtImagePath.Text.LastIndexOf(".")) + "_steg.JPG");
BitMiracle.LibJpeg.Classic.jpeg_compress_struct oJpegCompress = new BitMiracle.LibJpeg.Classic.jpeg_compress_struct();
oJpegCompress.jpeg_stdio_dest(objFileStreamMegaMap);
oJpegDecompress.jpeg_copy_critical_parameters(oJpegCompress);
oJpegCompress.Image_height = coverimage.Height;
oJpegCompress.Image_width = coverimage.Width;
oJpegCompress.jpeg_write_coefficients(DCTcoff);
oJpegCompress.jpeg_finish_compress();
objFileStreamMegaMap.Close();
oJpegDecompress.jpeg_abort_decompress();
oFileStreamImage.Close();
await controller.CloseAsync();
await this.ShowMessageAsync("Embedding Successful:", "File is saved to orignal image file directory with _steg after the original name.");
}
catch (Exception excep)
{ await this.ShowMessageAsync("Exception:", excep.Message); }
}
private async void messageExtract(object sender, RoutedEventArgs e)
{
if (dtxtImagePath.Text.Length == 0)
{
await this.ShowMessageAsync("Error:", "Image file is not selected.");
return;
}
try
{
var controller = await this.ShowProgressAsync("Please wait:", "Extracting...");
BitMiracle.LibJpeg.Classic.jpeg_decompress_struct oJpegDecompress = new BitMiracle.LibJpeg.Classic.jpeg_decompress_struct();
System.IO.FileStream oFileStreamImage = new System.IO.FileStream(dtxtImagePath.Text, System.IO.FileMode.Open, System.IO.FileAccess.Read);
oJpegDecompress.jpeg_stdio_src(oFileStreamImage);
oJpegDecompress.jpeg_read_header(true);
BitMiracle.LibJpeg.Classic.jvirt_array <BitMiracle.LibJpeg.Classic.JBLOCK>[] DCTcoff = oJpegDecompress.jpeg_read_coefficients();
int hightTemp = (int)Math.Ceiling(coverimage.Height / 8.0);
int widthTemp = (int)Math.Ceiling(coverimage.Width / 8.0);
int widthComponent1 = widthTemp % 2 == 0 ? widthTemp : widthTemp + 1;
int heightComponent1 = hightTemp % 2 == 0 ? hightTemp : hightTemp + 1;
int widthComponent2_3 = widthComponent1 / 2;
int heightComponent2_3 = heightComponent1 / 2;
StringBuilder dataBitsRetreived = new StringBuilder();
int number_RetrivedBits = 0;
bool operationTerminator = false;
for (int colorIterate = 0; colorIterate < 3 && !operationTerminator; colorIterate++)
{
int height = colorIterate == 0 ? heightComponent1 : heightComponent2_3, width = colorIterate == 0 ? widthComponent1 : widthComponent2_3;
for (int heightIteratein2D = 0; heightIteratein2D < height && !operationTerminator; heightIteratein2D++)
{
for (int widthIteratein2D = 0; widthIteratein2D < width && !operationTerminator; widthIteratein2D++)
{
for (int l = 1; l < 64 && !operationTerminator; l++)
{
short cofficent = DCTcoff[colorIterate].Access(heightIteratein2D, 1)[0][widthIteratein2D][l];
dataBitsRetreived.Append(cofficent & 1);
if (dataBitsRetreived.Length % 8 == 0 && dataBitsRetreived.ToString(dataBitsRetreived.Length - 8, 8).Equals("00000000"))
{
operationTerminator = true;
}
else
{
number_RetrivedBits++;
}
}
}
}
}
oJpegDecompress.jpeg_finish_decompress();
oFileStreamImage.Close();
string dataBitsToWrite = dataBitsRetreived.ToString(0, dataBitsRetreived.Length - 8);
byte[] dataBytes = new byte[dataBitsToWrite.Length / 8];
for (int i = 0; i + 8 <= dataBitsToWrite.Length; i = i + 8)
{
dataBytes[i / 8] = Convert.ToByte(dataBitsToWrite.Substring(i, 8), 2);
}
output.Text = Encoding.UTF8.GetString(dataBytes);
output.VerticalScrollBarVisibility = ScrollBarVisibility.Auto;
await controller.CloseAsync();
await this.ShowMessageAsync("Extraction Successful:", "Text is displayed in the text box.");
}
catch (Exception excep)
{ await this.ShowMessageAsync("Exception:", excep.Message); }
}
